Alloy



J veryl It containing ni Patented May 1, 1928.-

cu -en STATES 11mm. G. 0038010, 0! JACKSON HEIGHTS, NEW YORK, ASIGNOB T0ELEO'I'BO mLLLUBGICAL COMPANY, A COBPOBLTION OI WEST VIRGINIA.

ALLOY.

10 Drawing.

The invention comprises a group of qua-' which there have beenincorporated chro-' .mium and nickel. It will be understood that thealpha aluminum bronzes are compositions which contain (at room temratures) up to about 9% of aluminum, an I find it desirable to use inthe compositions of the invention an aluminum content toward this upperlimit, for exa'mple'between 6% and If chromium is added to moltenaluminum bronzes of the alpha type, it is found that little of thechromium becomes alloyed wit the bronze and that of this quantity onlyabout 0.4% at most goes into solid solu tion, the rest being in the formof separate grainlets. For the purposes of the invention it is desirableto increase the solid solubility of the chromium. I have found that thiscan be done with advantageous results by incorporating nickel into thealloy. Copper-a'luminum-mckel-chromium .alloys con- 30 taining 0.5% toabout 8% of chromium in solid solution have excellent corrosion resist-The alloys offthe invention can be preby mixing the ingredients in anyorder but "I have found the following moth od tobe advan u An alloy isprepared the, roportions desiredin the final allo and e nickel chromiumiscast-into s.

I An alpha aluminum bronze of the desired aluminum content is then.preparedand A while molten ia stirred with the nickel-chro mium rods.The latter duall dissolve in the molten bath, and t e stirring is'discontinued when the desired toguantity ofchr0 mium has been ineorporaApplication as m. 21,

and chromium in about me; Serial 117,507.

The alloys of the invention are workable by the methods usually aplicable to bronzes.

I prefer to .homogenize t sin by quenching from a temperature about 1000. below. its melting point, for exam le from about, 900 0. They maybequenc ed from somewhat lower temperatures, however, with similarresults.

Quenched specimens show, for example, a

0- When specimens of the alloys of the. in-

vention are immersed in various mildly corrosive agents fordefiniteperiods of time, the loss in weight is found to be as much as 50% lessthan in the case of carefully .prepared binary or ternary aluminumbronzes of equal aluminum content.

Specific proportions are given herein merely by way of illustration. Anyaluminum content within the alpha rangemay be used. The contentohchromium inso id solution may be higher than those referred to hereinand an excess of nickel over that aired to causethe chromiumto form asolid solution maybe used, but'such additional uantities-of these metalsincrease the cost 0 the alloy' and are unnecessary for most uses.Elements which do notdestroy the useful properties of the alloys, suchas iron, manganese, and cobalt and small quantities of zinc or tin, areof "course not preeluded. r 1 ,I claim: a

1. A bronze containing a substantial quan-' tity of aluminum not}greater than about9% w more than 0.5% of c romium in solid solution,andJsufiicient nickel to hold the chro-" mium in. solution.

' 2. 'A bronze having an-aluminum content within the approximate range6% to 8%; having a content of chromium greater than 0.6% and lessthanabout 8%'; and containing sufiicient nickel to hold the chromium inamolten bath of alpha aluminum bronze in solid solution. an dissolvingtherein, without separate 3. A bronze containing aluminum 6% to fusion,an alloy of nickel and chromium. l0 8%; chromium about 2%; and nickelabout In testimony whereof, I afiix my signa- 5 6%. ture.

4. The method of making a non-corrosive aluminum bronze which consistsof prepar- MICHAEL G. CORSON.

